drivers/s390/cio/device_fsm.c

   1 /*
   2  * drivers/s390/cio/device_fsm.c
   3  * finite state machine for device handling
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/string.h>
  15
  16 #include <asm/ccwdev.h>
  17 #include <asm/cio.h>
  18 #include <asm/chpid.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "chsc.h"
  25 #include "ioasm.h"
  26 #include "chp.h"
  27
  28 int
  29 device_is_online(struct subchannel *sch)
  30 {
  31         struct ccw_device *cdev;
  32
  33         if (!sch->dev.driver_data)
  34                 return 0;
  35         cdev = sch->dev.driver_data;
  36         return (cdev->private->state == DEV_STATE_ONLINE);
  37 }
  38
  39 int
  40 device_is_disconnected(struct subchannel *sch)
  41 {
  42         struct ccw_device *cdev;
  43
  44         if (!sch->dev.driver_data)
  45                 return 0;
  46         cdev = sch->dev.driver_data;
  47         return (cdev->private->state == DEV_STATE_DISCONNECTED ||
  48                 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
  49 }
  50
  51 void
  52 device_set_disconnected(struct subchannel *sch)
  53 {
  54         struct ccw_device *cdev;
  55
  56         if (!sch->dev.driver_data)
  57                 return;
  58         cdev = sch->dev.driver_data;
  59         ccw_device_set_timeout(cdev, 0);
  60         cdev->private->flags.fake_irb = 0;
  61         cdev->private->state = DEV_STATE_DISCONNECTED;
  62 }
  63
  64 void device_set_intretry(struct subchannel *sch)
  65 {
  66         struct ccw_device *cdev;
  67
  68         cdev = sch->dev.driver_data;
  69         if (!cdev)
  70                 return;
  71         cdev->private->flags.intretry = 1;
  72 }
  73
  74 int device_trigger_verify(struct subchannel *sch)
  75 {
  76         struct ccw_device *cdev;
  77
  78         cdev = sch->dev.driver_data;
  79         if (!cdev || !cdev->online)
  80                 return -EINVAL;
  81         dev_fsm_event(cdev, DEV_EVENT_VERIFY);
  82         return 0;
  83 }
  84
  85 /*
  86  * Timeout function. It just triggers a DEV_EVENT_TIMEOUT.
  87  */
  88 static void
  89 ccw_device_timeout(unsigned long data)
  90 {
  91         struct ccw_device *cdev;
  92
  93         cdev = (struct ccw_device *) data;
  94         spin_lock_irq(cdev->ccwlock);
  95         dev_fsm_event(cdev, DEV_EVENT_TIMEOUT);
  96         spin_unlock_irq(cdev->ccwlock);
  97 }
  98
  99 /*
 100  * Set timeout
 101  */
 102 void
 103 ccw_device_set_timeout(struct ccw_device *cdev, int expires)
 104 {
 105         if (expires == 0) {
 106                 del_timer(&cdev->private->timer);
 107                 return;
 108         }
 109         if (timer_pending(&cdev->private->timer)) {
 110                 if (mod_timer(&cdev->private->timer, jiffies + expires))
 111                         return;
 112         }
 113         cdev->private->timer.function = ccw_device_timeout;
 114         cdev->private->timer.data = (unsigned long) cdev;
 115         cdev->private->timer.expires = jiffies + expires;
 116         add_timer(&cdev->private->timer);
 117 }
 118
 119 /* Kill any pending timers after machine check. */
 120 void
 121 device_kill_pending_timer(struct subchannel *sch)
 122 {
 123         struct ccw_device *cdev;
 124
 125         if (!sch->dev.driver_data)
 126                 return;
 127         cdev = sch->dev.driver_data;
 128         ccw_device_set_timeout(cdev, 0);
 129 }
 130
 131 /*
 132  * Cancel running i/o. This is called repeatedly since halt/clear are
 133  * asynchronous operations. We do one try with cio_cancel, two tries
 134  * with cio_halt, 255 tries with cio_clear. If everythings fails panic.
 135  * Returns 0 if device now idle, -ENODEV for device not operational and
 136  * -EBUSY if an interrupt is expected (either from halt/clear or from a
 137  * status pending).
 138  */
 139 int
 140 ccw_device_cancel_halt_clear(struct ccw_device *cdev)
 141 {
 142         struct subchannel *sch;
 143         int ret;
 144
 145         sch = to_subchannel(cdev->dev.parent);
 146         ret = stsch(sch->schid, &sch->schib);
 147         if (ret || !sch->schib.pmcw.dnv)
 148                 return -ENODEV;
 149         if (!sch->schib.pmcw.ena)
 150                 /* Not operational -> done. */
 151                 return 0;
 152         /* Stage 1: cancel io. */
 153         if (!(sch->schib.scsw.actl & SCSW_ACTL_HALT_PEND) &&
 154             !(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 155                 ret = cio_cancel(sch);
 156                 if (ret != -EINVAL)
 157                         return ret;
 158                 /* cancel io unsuccessful. From now on it is asynchronous. */
 159                 cdev->private->iretry = 3;      /* 3 halt retries. */
 160         }
 161         if (!(sch->schib.scsw.actl & SCSW_ACTL_CLEAR_PEND)) {
 162                 /* Stage 2: halt io. */
 163                 if (cdev->private->iretry) {
 164                         cdev->private->iretry--;
 165                         ret = cio_halt(sch);
 166                         if (ret != -EBUSY)
 167                                 return (ret == 0) ? -EBUSY : ret;
 168                 }
 169                 /* halt io unsuccessful. */
 170                 cdev->private->iretry = 255;    /* 255 clear retries. */
 171         }
 172         /* Stage 3: clear io. */
 173         if (cdev->private->iretry) {
 174                 cdev->private->iretry--;
 175                 ret = cio_clear (sch);
 176                 return (ret == 0) ? -EBUSY : ret;
 177         }
 178         panic("Can't stop i/o on subchannel.\n");
 179 }
 180
 181 static int
 182 ccw_device_handle_oper(struct ccw_device *cdev)
 183 {
 184         struct subchannel *sch;
 185
 186         sch = to_subchannel(cdev->dev.parent);
 187         cdev->private->flags.recog_done = 1;
 188         /*
 189          * Check if cu type and device type still match. If
 190          * not, it is certainly another device and we have to
 191          * de- and re-register.
 192          */
 193         if (cdev->id.cu_type != cdev->private->senseid.cu_type ||
 194             cdev->id.cu_model != cdev->private->senseid.cu_model ||
 195             cdev->id.dev_type != cdev->private->senseid.dev_type ||
 196             cdev->id.dev_model != cdev->private->senseid.dev_model) {
 197                 PREPARE_WORK(&cdev->private->kick_work,
 198                              ccw_device_do_unreg_rereg);
 199                 queue_work(ccw_device_work, &cdev->private->kick_work);
 200                 return 0;
 201         }
 202         cdev->private->flags.donotify = 1;
 203         return 1;
 204 }
 205
 206 /*
 207  * The machine won't give us any notification by machine check if a chpid has
 208  * been varied online on the SE so we have to find out by magic (i. e. driving
 209  * the channel subsystem to device selection and updating our path masks).
 210  */
 211 static void
 212 __recover_lost_chpids(struct subchannel *sch, int old_lpm)
 213 {
 214         int mask, i;
 215         struct chp_id chpid;
 216
 217         chp_id_init(&chpid);
 218         for (i = 0; i<8; i++) {
 219                 mask = 0x80 >> i;
 220                 if (!(sch->lpm & mask))
 221                         continue;
 222                 if (old_lpm & mask)
 223                         continue;
 224                 chpid.id = sch->schib.pmcw.chpid[i];
 225                 if (!chp_is_registered(chpid))
 226                         css_schedule_eval_all();
 227         }
 228 }
 229
 230 /*
 231  * Stop device recognition.
 232  */
 233 static void
 234 ccw_device_recog_done(struct ccw_device *cdev, int state)
 235 {
 236         struct subchannel *sch;
 237         int notify, old_lpm, same_dev;
 238
 239         sch = to_subchannel(cdev->dev.parent);
 240
 241         ccw_device_set_timeout(cdev, 0);
 242         cio_disable_subchannel(sch);
 243         /*
 244          * Now that we tried recognition, we have performed device selection
 245          * through ssch() and the path information is up to date.
 246          */
 247         old_lpm = sch->lpm;
 248         stsch(sch->schid, &sch->schib);
 249         sch->lpm = sch->schib.pmcw.pam & sch->opm;
 250         /* Check since device may again have become not operational. */
 251         if (!sch->schib.pmcw.dnv)
 252                 state = DEV_STATE_NOT_OPER;
 253         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 254                 /* Force reprobe on all chpids. */
 255                 old_lpm = 0;
 256         if (sch->lpm != old_lpm)
 257                 __recover_lost_chpids(sch, old_lpm);
 258         if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 259                 if (state == DEV_STATE_NOT_OPER) {
 260                         cdev->private->flags.recog_done = 1;
 261                         cdev->private->state = DEV_STATE_DISCONNECTED;
 262                         return;
 263                 }
 264                 /* Boxed devices don't need extra treatment. */
 265         }
 266         notify = 0;
 267         same_dev = 0; /* Keep the compiler quiet... */
 268         switch (state) {
 269         case DEV_STATE_NOT_OPER:
 270                 CIO_DEBUG(KERN_WARNING, 2,
 271                           "cio: SenseID : unknown device %04x on subchannel "
 272                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 273                           sch->schid.ssid, sch->schid.sch_no);
 274                 break;
 275         case DEV_STATE_OFFLINE:
 276                 if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
 277                         same_dev = ccw_device_handle_oper(cdev);
 278                         notify = 1;
 279                 }
 280                 /* fill out sense information */
 281                 memset(&cdev->id, 0, sizeof(cdev->id));
 282                 cdev->id.cu_type   = cdev->private->senseid.cu_type;
 283                 cdev->id.cu_model  = cdev->private->senseid.cu_model;
 284                 cdev->id.dev_type  = cdev->private->senseid.dev_type;
 285                 cdev->id.dev_model = cdev->private->senseid.dev_model;
 286                 if (notify) {
 287                         cdev->private->state = DEV_STATE_OFFLINE;
 288                         if (same_dev) {
 289                                 /* Get device online again. */
 290                                 ccw_device_online(cdev);
 291                                 wake_up(&cdev->private->wait_q);
 292                         }
 293                         return;
 294                 }
 295                 /* Issue device info message. */
 296                 CIO_DEBUG(KERN_INFO, 2,
 297                           "cio: SenseID : device 0.%x.%04x reports: "
 298                           "CU  Type/Mod = %04X/%02X, Dev Type/Mod = "
 299                           "%04X/%02X\n",
 300                           cdev->private->dev_id.ssid,
 301                           cdev->private->dev_id.devno,
 302                           cdev->id.cu_type, cdev->id.cu_model,
 303                           cdev->id.dev_type, cdev->id.dev_model);
 304                 break;
 305         case DEV_STATE_BOXED:
 306                 CIO_DEBUG(KERN_WARNING, 2,
 307                           "cio: SenseID : boxed device %04x on subchannel "
 308                           "0.%x.%04x\n", cdev->private->dev_id.devno,
 309                           sch->schid.ssid, sch->schid.sch_no);
 310                 break;
 311         }
 312         cdev->private->state = state;
 313         io_subchannel_recog_done(cdev);
 314         if (state != DEV_STATE_NOT_OPER)
 315                 wake_up(&cdev->private->wait_q);
 316 }
 317
 318 /*
 319  * Function called from device_id.c after sense id has completed.
 320  */
 321 void
 322 ccw_device_sense_id_done(struct ccw_device *cdev, int err)
 323 {
 324         switch (err) {
 325         case 0:
 326                 ccw_device_recog_done(cdev, DEV_STATE_OFFLINE);
 327                 break;
 328         case -ETIME:            /* Sense id stopped by timeout. */
 329                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 330                 break;
 331         default:
 332                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 333                 break;
 334         }
 335 }
 336
 337 static void
 338 ccw_device_oper_notify(struct work_struct *work)
 339 {
 340         struct ccw_device_private *priv;
 341         struct ccw_device *cdev;
 342         struct subchannel *sch;
 343         int ret;
 344         unsigned long flags;
 345
 346         priv = container_of(work, struct ccw_device_private, kick_work);
 347         cdev = priv->cdev;
 348         spin_lock_irqsave(cdev->ccwlock, flags);
 349         sch = to_subchannel(cdev->dev.parent);
 350         if (sch->driver && sch->driver->notify) {
 351                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 352                 ret = sch->driver->notify(&sch->dev, CIO_OPER);
 353                 spin_lock_irqsave(cdev->ccwlock, flags);
 354         } else
 355                 ret = 0;
 356         if (ret) {
 357                 /* Reenable channel measurements, if needed. */
 358                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 359                 cmf_reenable(cdev);
 360                 spin_lock_irqsave(cdev->ccwlock, flags);
 361                 wake_up(&cdev->private->wait_q);
 362         }
 363         spin_unlock_irqrestore(cdev->ccwlock, flags);
 364         if (!ret)
 365                 /* Driver doesn't want device back. */
 366                 ccw_device_do_unreg_rereg(work);
 367 }
 368
 369 /*
 370  * Finished with online/offline processing.
 371  */
 372 static void
 373 ccw_device_done(struct ccw_device *cdev, int state)
 374 {
 375         struct subchannel *sch;
 376
 377         sch = to_subchannel(cdev->dev.parent);
 378
 379         ccw_device_set_timeout(cdev, 0);
 380
 381         if (state != DEV_STATE_ONLINE)
 382                 cio_disable_subchannel(sch);
 383
 384         /* Reset device status. */
 385         memset(&cdev->private->irb, 0, sizeof(struct irb));
 386
 387         cdev->private->state = state;
 388
 389
 390         if (state == DEV_STATE_BOXED)
 391                 CIO_DEBUG(KERN_WARNING, 2,
 392                           "cio: Boxed device %04x on subchannel %04x\n",
 393                           cdev->private->dev_id.devno, sch->schid.sch_no);
 394
 395         if (cdev->private->flags.donotify) {
 396                 cdev->private->flags.donotify = 0;
 397                 PREPARE_WORK(&cdev->private->kick_work, ccw_device_oper_notify);
 398                 queue_work(ccw_device_notify_work, &cdev->private->kick_work);
 399         }
 400         wake_up(&cdev->private->wait_q);
 401
 402         if (css_init_done && state != DEV_STATE_ONLINE)
 403                 put_device (&cdev->dev);
 404 }
 405
 406 static int cmp_pgid(struct pgid *p1, struct pgid *p2)
 407 {
 408         char *c1;
 409         char *c2;
 410
 411         c1 = (char *)p1;
 412         c2 = (char *)p2;
 413
 414         return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
 415 }
 416
 417 static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
 418 {
 419         int i;
 420         int last;
 421
 422         last = 0;
 423         for (i = 0; i < 8; i++) {
 424                 if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
 425                         /* No PGID yet */
 426                         continue;
 427                 if (cdev->private->pgid[last].inf.ps.state1 ==
 428                     SNID_STATE1_RESET) {
 429                         /* First non-zero PGID */
 430                         last = i;
 431                         continue;
 432                 }
 433                 if (cmp_pgid(&cdev->private->pgid[i],
 434                              &cdev->private->pgid[last]) == 0)
 435                         /* Non-conflicting PGIDs */
 436                         continue;
 437
 438                 /* PGID mismatch, can't pathgroup. */
 439                 CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
 440                               "0.%x.%04x, can't pathgroup\n",
 441                               cdev->private->dev_id.ssid,
 442                               cdev->private->dev_id.devno);
 443                 cdev->private->options.pgroup = 0;
 444                 return;
 445         }
 446         if (cdev->private->pgid[last].inf.ps.state1 ==
 447             SNID_STATE1_RESET)
 448                 /* No previous pgid found */
 449                 memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
 450                        sizeof(struct pgid));
 451         else
 452                 /* Use existing pgid */
 453                 memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
 454                        sizeof(struct pgid));
 455 }
 456
 457 /*
 458  * Function called from device_pgid.c after sense path ground has completed.
 459  */
 460 void
 461 ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
 462 {
 463         struct subchannel *sch;
 464
 465         sch = to_subchannel(cdev->dev.parent);
 466         switch (err) {
 467         case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
 468                 cdev->private->options.pgroup = 0;
 469                 break;
 470         case 0: /* success */
 471         case -EACCES: /* partial success, some paths not operational */
 472                 /* Check if all pgids are equal or 0. */
 473                 __ccw_device_get_common_pgid(cdev);
 474                 break;
 475         case -ETIME:            /* Sense path group id stopped by timeout. */
 476         case -EUSERS:           /* device is reserved for someone else. */
 477                 ccw_device_done(cdev, DEV_STATE_BOXED);
 478                 return;
 479         default:
 480                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 481                 return;
 482         }
 483         /* Start Path Group verification. */
 484         cdev->private->state = DEV_STATE_VERIFY;
 485         cdev->private->flags.doverify = 0;
 486         ccw_device_verify_start(cdev);
 487 }
 488
 489 /*
 490  * Start device recognition.
 491  */
 492 int
 493 ccw_device_recognition(struct ccw_device *cdev)
 494 {
 495         struct subchannel *sch;
 496         int ret;
 497
 498         if ((cdev->private->state != DEV_STATE_NOT_OPER) &&
 499             (cdev->private->state != DEV_STATE_BOXED))
 500                 return -EINVAL;
 501         sch = to_subchannel(cdev->dev.parent);
 502         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 503         if (ret != 0)
 504                 /* Couldn't enable the subchannel for i/o. Sick device. */
 505                 return ret;
 506
 507         /* After 60s the device recognition is considered to have failed. */
 508         ccw_device_set_timeout(cdev, 60*HZ);
 509
 510         /*
 511          * We used to start here with a sense pgid to find out whether a device
 512          * is locked by someone else. Unfortunately, the sense pgid command
 513          * code has other meanings on devices predating the path grouping
 514          * algorithm, so we start with sense id and box the device after an
 515          * timeout (or if sense pgid during path verification detects the device
 516          * is locked, as may happen on newer devices).
 517          */
 518         cdev->private->flags.recog_done = 0;
 519         cdev->private->state = DEV_STATE_SENSE_ID;
 520         ccw_device_sense_id_start(cdev);
 521         return 0;
 522 }
 523
 524 /*
 525  * Handle timeout in device recognition.
 526  */
 527 static void
 528 ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 529 {
 530         int ret;
 531
 532         ret = ccw_device_cancel_halt_clear(cdev);
 533         switch (ret) {
 534         case 0:
 535                 ccw_device_recog_done(cdev, DEV_STATE_BOXED);
 536                 break;
 537         case -ENODEV:
 538                 ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 539                 break;
 540         default:
 541                 ccw_device_set_timeout(cdev, 3*HZ);
 542         }
 543 }
 544
 545
 546 static void
 547 ccw_device_nopath_notify(struct work_struct *work)
 548 {
 549         struct ccw_device_private *priv;
 550         struct ccw_device *cdev;
 551         struct subchannel *sch;
 552         int ret;
 553         unsigned long flags;
 554
 555         priv = container_of(work, struct ccw_device_private, kick_work);
 556         cdev = priv->cdev;
 557         spin_lock_irqsave(cdev->ccwlock, flags);
 558         sch = to_subchannel(cdev->dev.parent);
 559         /* Extra sanity. */
 560         if (sch->lpm)
 561                 goto out_unlock;
 562         if (sch->driver && sch->driver->notify) {
 563                 spin_unlock_irqrestore(cdev->ccwlock, flags);
 564                 ret = sch->driver->notify(&sch->dev, CIO_NO_PATH);
 565                 spin_lock_irqsave(cdev->ccwlock, flags);
 566         } else
 567                 ret = 0;
 568         if (!ret) {
 569                 if (get_device(&sch->dev)) {
 570                         /* Driver doesn't want to keep device. */
 571                         cio_disable_subchannel(sch);
 572                         if (get_device(&cdev->dev)) {
 573                                 PREPARE_WORK(&cdev->private->kick_work,
 574                                              ccw_device_call_sch_unregister);
 575                                 queue_work(ccw_device_work,
 576                                            &cdev->private->kick_work);
 577                         } else
 578                                 put_device(&sch->dev);
 579                 }
 580         } else {
 581                 cio_disable_subchannel(sch);
 582                 ccw_device_set_timeout(cdev, 0);
 583                 cdev->private->flags.fake_irb = 0;
 584                 cdev->private->state = DEV_STATE_DISCONNECTED;
 585                 wake_up(&cdev->private->wait_q);
 586         }
 587 out_unlock:
 588         spin_unlock_irqrestore(cdev->ccwlock, flags);
 589 }
 590
 591 void
 592 ccw_device_verify_done(struct ccw_device *cdev, int err)
 593 {
 594         struct subchannel *sch;
 595
 596         sch = to_subchannel(cdev->dev.parent);
 597         /* Update schib - pom may have changed. */
 598         stsch(sch->schid, &sch->schib);
 599         /* Update lpm with verified path mask. */
 600         sch->lpm = sch->vpm;
 601         /* Repeat path verification? */
 602         if (cdev->private->flags.doverify) {
 603                 cdev->private->flags.doverify = 0;
 604                 ccw_device_verify_start(cdev);
 605                 return;
 606         }
 607         switch (err) {
 608         case -EOPNOTSUPP: /* path grouping not supported, just set online. */
 609                 cdev->private->options.pgroup = 0;
 610         case 0:
 611                 ccw_device_done(cdev, DEV_STATE_ONLINE);
 612                 /* Deliver fake irb to device driver, if needed. */
 613                 if (cdev->private->flags.fake_irb) {
 614                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 615                         cdev->private->irb.scsw.cc = 1;
 616                         cdev->private->irb.scsw.fctl = SCSW_FCTL_START_FUNC;
 617                         cdev->private->irb.scsw.actl = SCSW_ACTL_START_PEND;
 618                         cdev->private->irb.scsw.stctl = SCSW_STCTL_STATUS_PEND;
 619                         cdev->private->flags.fake_irb = 0;
 620                         if (cdev->handler)
 621                                 cdev->handler(cdev, cdev->private->intparm,
 622                                               &cdev->private->irb);
 623                         memset(&cdev->private->irb, 0, sizeof(struct irb));
 624                 }
 625                 break;
 626         case -ETIME:
 627                 /* Reset oper notify indication after verify error. */
 628                 cdev->private->flags.donotify = 0;
 629                 ccw_device_done(cdev, DEV_STATE_BOXED);
 630                 break;
 631         default:
 632                 /* Reset oper notify indication after verify error. */
 633                 cdev->private->flags.donotify = 0;
 634                 if (cdev->online) {
 635                         PREPARE_WORK(&cdev->private->kick_work,
 636                                      ccw_device_nopath_notify);
 637                         queue_work(ccw_device_notify_work,
 638                                    &cdev->private->kick_work);
 639                 } else
 640                         ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 641                 break;
 642         }
 643 }
 644
 645 /*
 646  * Get device online.
 647  */
 648 int
 649 ccw_device_online(struct ccw_device *cdev)
 650 {
 651         struct subchannel *sch;
 652         int ret;
 653
 654         if ((cdev->private->state != DEV_STATE_OFFLINE) &&
 655             (cdev->private->state != DEV_STATE_BOXED))
 656                 return -EINVAL;
 657         sch = to_subchannel(cdev->dev.parent);
 658         if (css_init_done && !get_device(&cdev->dev))
 659                 return -ENODEV;
 660         ret = cio_enable_subchannel(sch, sch->schib.pmcw.isc);
 661         if (ret != 0) {
 662                 /* Couldn't enable the subchannel for i/o. Sick device. */
 663                 if (ret == -ENODEV)
 664                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 665                 return ret;
 666         }
 667         /* Do we want to do path grouping? */
 668         if (!cdev->private->options.pgroup) {
 669                 /* Start initial path verification. */
 670                 cdev->private->state = DEV_STATE_VERIFY;
 671                 cdev->private->flags.doverify = 0;
 672                 ccw_device_verify_start(cdev);
 673                 return 0;
 674         }
 675         /* Do a SensePGID first. */
 676         cdev->private->state = DEV_STATE_SENSE_PGID;
 677         ccw_device_sense_pgid_start(cdev);
 678         return 0;
 679 }
 680
 681 void
 682 ccw_device_disband_done(struct ccw_device *cdev, int err)
 683 {
 684         switch (err) {
 685         case 0:
 686                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 687                 break;
 688         case -ETIME:
 689                 ccw_device_done(cdev, DEV_STATE_BOXED);
 690                 break;
 691         default:
 692                 cdev->private->flags.donotify = 0;
 693                 if (get_device(&cdev->dev)) {
 694                         PREPARE_WORK(&cdev->private->kick_work,
 695                                      ccw_device_call_sch_unregister);
 696                         queue_work(ccw_device_work, &cdev->private->kick_work);
 697                 }
 698                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 699                 break;
 700         }
 701 }
 702
 703 /*
 704  * Shutdown device.
 705  */
 706 int
 707 ccw_device_offline(struct ccw_device *cdev)
 708 {
 709         struct subchannel *sch;
 710
 711         if (ccw_device_is_orphan(cdev)) {
 712                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 713                 return 0;
 714         }
 715         sch = to_subchannel(cdev->dev.parent);
 716         if (stsch(sch->schid, &sch->schib) || !sch->schib.pmcw.dnv)
 717                 return -ENODEV;
 718         if (cdev->private->state != DEV_STATE_ONLINE) {
 719                 if (sch->schib.scsw.actl != 0)
 720                         return -EBUSY;
 721                 return -EINVAL;
 722         }
 723         if (sch->schib.scsw.actl != 0)
 724                 return -EBUSY;
 725         /* Are we doing path grouping? */
 726         if (!cdev->private->options.pgroup) {
 727                 /* No, set state offline immediately. */
 728                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
 729                 return 0;
 730         }
 731         /* Start Set Path Group commands. */
 732         cdev->private->state = DEV_STATE_DISBAND_PGID;
 733         ccw_device_disband_start(cdev);
 734         return 0;
 735 }
 736
 737 /*
 738  * Handle timeout in device online/offline process.
 739  */
 740 static void
 741 ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 742 {
 743         int ret;
 744
 745         ret = ccw_device_cancel_halt_clear(cdev);
 746         switch (ret) {
 747         case 0:
 748                 ccw_device_done(cdev, DEV_STATE_BOXED);
 749                 break;
 750         case -ENODEV:
 751                 ccw_device_done(cdev, DEV_STATE_NOT_OPER);
 752                 break;
 753         default:
 754                 ccw_device_set_timeout(cdev, 3*HZ);
 755         }
 756 }
 757
 758 /*
 759  * Handle not oper event in device recognition.
 760  */
 761 static void
 762 ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 763 {
 764         ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
 765 }
 766
 767 /*
 768  * Handle not operational event while offline.
 769  */
 770 static void
 771 ccw_device_offline_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 772 {
 773         struct subchannel *sch;
 774
 775         cdev->private->state = DEV_STATE_NOT_OPER;
 776         sch = to_subchannel(cdev->dev.parent);
 777         if (get_device(&cdev->dev)) {
 778                 PREPARE_WORK(&cdev->private->kick_work,
 779                              ccw_device_call_sch_unregister);
 780                 queue_work(ccw_device_work, &cdev->private->kick_work);
 781         }
 782         wake_up(&cdev->private->wait_q);
 783 }
 784
 785 /*
 786  * Handle not operational event while online.
 787  */
 788 static void
 789 ccw_device_online_notoper(struct ccw_device *cdev, enum dev_event dev_event)
 790 {
 791         struct subchannel *sch;
 792         int ret;
 793
 794         sch = to_subchannel(cdev->dev.parent);
 795         if (sch->driver->notify) {
 796                 spin_unlock_irq(cdev->ccwlock);
 797                 ret = sch->driver->notify(&sch->dev,
 798                                           sch->lpm ? CIO_GONE : CIO_NO_PATH);
 799                 spin_lock_irq(cdev->ccwlock);
 800         } else
 801                 ret = 0;
 802         if (ret) {
 803                 ccw_device_set_timeout(cdev, 0);
 804                 cdev->private->flags.fake_irb = 0;
 805                 cdev->private->state = DEV_STATE_DISCONNECTED;
 806                 wake_up(&cdev->private->wait_q);
 807                 return;
 808         }
 809         cdev->private->state = DEV_STATE_NOT_OPER;
 810         cio_disable_subchannel(sch);
 811         if (sch->schib.scsw.actl != 0) {
 812                 // FIXME: not-oper indication to device driver ?
 813                 ccw_device_call_handler(cdev);
 814         }
 815         if (get_device(&cdev->dev)) {
 816                 PREPARE_WORK(&cdev->private->kick_work,
 817                              ccw_device_call_sch_unregister);
 818                 queue_work(ccw_device_work, &cdev->private->kick_work);
 819         }
 820         wake_up(&cdev->private->wait_q);
 821 }
 822
 823 /*
 824  * Handle path verification event.
 825  */
 826 static void
 827 ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
 828 {
 829         struct subchannel *sch;
 830
 831         if (cdev->private->state == DEV_STATE_W4SENSE) {
 832                 cdev->private->flags.doverify = 1;
 833                 return;
 834         }
 835         sch = to_subchannel(cdev->dev.parent);
 836         /*
 837          * Since we might not just be coming from an interrupt from the
 838          * subchannel we have to update the schib.
 839          */
 840         stsch(sch->schid, &sch->schib);
 841
 842         if (sch->schib.scsw.actl != 0 ||
 843             (sch->schib.scsw.stctl & SCSW_STCTL_STATUS_PEND) ||
 844             (cdev->private->irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)) {
 845                 /*
 846                  * No final status yet or final status not yet delivered
 847                  * to the device driver. Can't do path verfication now,
 848                  * delay until final status was delivered.
 849                  */
 850                 cdev->private->flags.doverify = 1;
 851                 return;
 852         }
 853         /* Device is idle, we can do the path verification. */
 854         cdev->private->state = DEV_STATE_VERIFY;
 855         cdev->private->flags.doverify = 0;
 856         ccw_device_verify_start(cdev);
 857 }
 858
 859 /*
 860  * Got an interrupt for a normal io (state online).
 861  */
 862 static void
 863 ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
 864 {
 865         struct irb *irb;
 866
 867         irb = (struct irb *) __LC_IRB;
 868         /* Check for unsolicited interrupt. */
 869         if ((irb->scsw.stctl ==
 870                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS))
 871             && (!irb->scsw.cc)) {
 872                 if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 873                     !irb->esw.esw0.erw.cons) {
 874                         /* Unit check but no sense data. Need basic sense. */
 875                         if (ccw_device_do_sense(cdev, irb) != 0)
 876                                 goto call_handler_unsol;
 877                         memcpy(&cdev->private->irb, irb, sizeof(struct irb));
 878                         cdev->private->state = DEV_STATE_W4SENSE;
 879                         cdev->private->intparm = 0;
 880                         return;
 881                 }
 882 call_handler_unsol:
 883                 if (cdev->handler)
 884                         cdev->handler (cdev, 0, irb);
 885                 if (cdev->private->flags.doverify)
 886                         ccw_device_online_verify(cdev, 0);
 887                 return;
 888         }
 889         /* Accumulate status and find out if a basic sense is needed. */
 890         ccw_device_accumulate_irb(cdev, irb);
 891         if (cdev->private->flags.dosense) {
 892                 if (ccw_device_do_sense(cdev, irb) == 0) {
 893                         cdev->private->state = DEV_STATE_W4SENSE;
 894                 }
 895                 return;
 896         }
 897         /* Call the handler. */
 898         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 899                 /* Start delayed path verification. */
 900                 ccw_device_online_verify(cdev, 0);
 901 }
 902
 903 /*
 904  * Got an timeout in online state.
 905  */
 906 static void
 907 ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
 908 {
 909         int ret;
 910
 911         ccw_device_set_timeout(cdev, 0);
 912         ret = ccw_device_cancel_halt_clear(cdev);
 913         if (ret == -EBUSY) {
 914                 ccw_device_set_timeout(cdev, 3*HZ);
 915                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
 916                 return;
 917         }
 918         if (ret == -ENODEV) {
 919                 struct subchannel *sch;
 920
 921                 sch = to_subchannel(cdev->dev.parent);
 922                 if (!sch->lpm) {
 923                         PREPARE_WORK(&cdev->private->kick_work,
 924                                      ccw_device_nopath_notify);
 925                         queue_work(ccw_device_notify_work,
 926                                    &cdev->private->kick_work);
 927                 } else
 928                         dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
 929         } else if (cdev->handler)
 930                 cdev->handler(cdev, cdev->private->intparm,
 931                               ERR_PTR(-ETIMEDOUT));
 932 }
 933
 934 /*
 935  * Got an interrupt for a basic sense.
 936  */
 937 static void
 938 ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
 939 {
 940         struct irb *irb;
 941
 942         irb = (struct irb *) __LC_IRB;
 943         /* Check for unsolicited interrupt. */
 944         if (irb->scsw.stctl ==
 945                         (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
 946                 if (irb->scsw.cc == 1)
 947                         /* Basic sense hasn't started. Try again. */
 948                         ccw_device_do_sense(cdev, irb);
 949                 else {
 950                         CIO_MSG_EVENT(2, "Huh? 0.%x.%04x: unsolicited "
 951                                       "interrupt during w4sense...\n",
 952                                       cdev->private->dev_id.ssid,
 953                                       cdev->private->dev_id.devno);
 954                         if (cdev->handler)
 955                                 cdev->handler (cdev, 0, irb);
 956                 }
 957                 return;
 958         }
 959         /*
 960          * Check if a halt or clear has been issued in the meanwhile. If yes,
 961          * only deliver the halt/clear interrupt to the device driver as if it
 962          * had killed the original request.
 963          */
 964         if (irb->scsw.fctl & (SCSW_FCTL_CLEAR_FUNC | SCSW_FCTL_HALT_FUNC)) {
 965                 /* Retry Basic Sense if requested. */
 966                 if (cdev->private->flags.intretry) {
 967                         cdev->private->flags.intretry = 0;
 968                         ccw_device_do_sense(cdev, irb);
 969                         return;
 970                 }
 971                 cdev->private->flags.dosense = 0;
 972                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 973                 ccw_device_accumulate_irb(cdev, irb);
 974                 goto call_handler;
 975         }
 976         /* Add basic sense info to irb. */
 977         ccw_device_accumulate_basic_sense(cdev, irb);
 978         if (cdev->private->flags.dosense) {
 979                 /* Another basic sense is needed. */
 980                 ccw_device_do_sense(cdev, irb);
 981                 return;
 982         }
 983 call_handler:
 984         cdev->private->state = DEV_STATE_ONLINE;
 985         /* Call the handler. */
 986         if (ccw_device_call_handler(cdev) && cdev->private->flags.doverify)
 987                 /* Start delayed path verification. */
 988                 ccw_device_online_verify(cdev, 0);
 989 }
 990
 991 static void
 992 ccw_device_clear_verify(struct ccw_device *cdev, enum dev_event dev_event)
 993 {
 994         struct irb *irb;
 995
 996         irb = (struct irb *) __LC_IRB;
 997         /* Accumulate status. We don't do basic sense. */
 998         ccw_device_accumulate_irb(cdev, irb);
 999         /* Remember to clear irb to avoid residuals. */
1000         memset(&cdev->private->irb, 0, sizeof(struct irb));
1001         /* Try to start delayed device verification. */
1002         ccw_device_online_verify(cdev, 0);
1003         /* Note: Don't call handler for cio initiated clear! */
1004 }
1005
1006 static void
1007 ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
1008 {
1009         struct subchannel *sch;
1010
1011         sch = to_subchannel(cdev->dev.parent);
1012         ccw_device_set_timeout(cdev, 0);
1013         /* Start delayed path verification. */
1014         ccw_device_online_verify(cdev, 0);
1015         /* OK, i/o is dead now. Call interrupt handler. */
1016         if (cdev->handler)
1017                 cdev->handler(cdev, cdev->private->intparm,
1018                               ERR_PTR(-EIO));
1019 }
1020
1021 static void
1022 ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1023 {
1024         int ret;
1025
1026         ret = ccw_device_cancel_halt_clear(cdev);
1027         if (ret == -EBUSY) {
1028                 ccw_device_set_timeout(cdev, 3*HZ);
1029                 return;
1030         }
1031         /* Start delayed path verification. */
1032         ccw_device_online_verify(cdev, 0);
1033         if (cdev->handler)
1034                 cdev->handler(cdev, cdev->private->intparm,
1035                               ERR_PTR(-EIO));
1036 }
1037
1038 void device_kill_io(struct subchannel *sch)
1039 {
1040         int ret;
1041         struct ccw_device *cdev;
1042
1043         cdev = sch->dev.driver_data;
1044         ret = ccw_device_cancel_halt_clear(cdev);
1045         if (ret == -EBUSY) {
1046                 ccw_device_set_timeout(cdev, 3*HZ);
1047                 cdev->private->state = DEV_STATE_TIMEOUT_KILL;
1048                 return;
1049         }
1050         /* Start delayed path verification. */
1051         ccw_device_online_verify(cdev, 0);
1052         if (cdev->handler)
1053                 cdev->handler(cdev, cdev->private->intparm,
1054                               ERR_PTR(-EIO));
1055 }
1056
1057 static void
1058 ccw_device_delay_verify(struct ccw_device *cdev, enum dev_event dev_event)
1059 {
1060         /* Start verification after current task finished. */
1061         cdev->private->flags.doverify = 1;
1062 }
1063
1064 static void
1065 ccw_device_stlck_done(struct ccw_device *cdev, enum dev_event dev_event)
1066 {
1067         struct irb *irb;
1068
1069         switch (dev_event) {
1070         case DEV_EVENT_INTERRUPT:
1071                 irb = (struct irb *) __LC_IRB;
1072                 /* Check for unsolicited interrupt. */
1073                 if ((irb->scsw.stctl ==
1074                      (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
1075                     (!irb->scsw.cc))
1076                         /* FIXME: we should restart stlck here, but this
1077                          * is extremely unlikely ... */
1078                         goto out_wakeup;
1079
1080                 ccw_device_accumulate_irb(cdev, irb);
1081                 /* We don't care about basic sense etc. */
1082                 break;
1083         default: /* timeout */
1084                 break;
1085         }
1086 out_wakeup:
1087         wake_up(&cdev->private->wait_q);
1088 }
1089
1090 static void
1091 ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
1092 {
1093         struct subchannel *sch;
1094
1095         sch = to_subchannel(cdev->dev.parent);
1096         if (cio_enable_subchannel(sch, sch->schib.pmcw.isc) != 0)
1097                 /* Couldn't enable the subchannel for i/o. Sick device. */
1098                 return;
1099
1100         /* After 60s the device recognition is considered to have failed. */
1101         ccw_device_set_timeout(cdev, 60*HZ);
1102
1103         cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
1104         ccw_device_sense_id_start(cdev);
1105 }
1106
1107 void
1108 device_trigger_reprobe(struct subchannel *sch)
1109 {
1110         struct ccw_device *cdev;
1111
1112         if (!sch->dev.driver_data)
1113                 return;
1114         cdev = sch->dev.driver_data;
1115         if (cdev->private->state != DEV_STATE_DISCONNECTED)
1116                 return;
1117
1118         /* Update some values. */
1119         if (stsch(sch->schid, &sch->schib))
1120                 return;
1121         if (!sch->schib.pmcw.dnv)
1122                 return;
1123         /*
1124          * The pim, pam, pom values may not be accurate, but they are the best
1125          * we have before performing device selection :/
1126          */
1127         sch->lpm = sch->schib.pmcw.pam & sch->opm;
1128         /* Re-set some bits in the pmcw that were lost. */
1129         sch->schib.pmcw.isc = 3;
1130         sch->schib.pmcw.csense = 1;
1131         sch->schib.pmcw.ena = 0;
1132         if ((sch->lpm & (sch->lpm - 1)) != 0)
1133                 sch->schib.pmcw.mp = 1;
1134         sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
1135         /* We should also udate ssd info, but this has to wait. */
1136         /* Check if this is another device which appeared on the same sch. */
1137         if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1138                 PREPARE_WORK(&cdev->private->kick_work,
1139                              ccw_device_move_to_orphanage);
1140                 queue_work(ccw_device_work, &cdev->private->kick_work);
1141         } else
1142                 ccw_device_start_id(cdev, 0);
1143 }
1144
1145 static void
1146 ccw_device_offline_irq(struct ccw_device *cdev, enum dev_event dev_event)
1147 {
1148         struct subchannel *sch;
1149
1150         sch = to_subchannel(cdev->dev.parent);
1151         /*
1152          * An interrupt in state offline means a previous disable was not
1153          * successful. Try again.
1154          */
1155         cio_disable_subchannel(sch);
1156 }
1157
1158 static void
1159 ccw_device_change_cmfstate(struct ccw_device *cdev, enum dev_event dev_event)
1160 {
1161         retry_set_schib(cdev);
1162         cdev->private->state = DEV_STATE_ONLINE;
1163         dev_fsm_event(cdev, dev_event);
1164 }
1165
1166 static void ccw_device_update_cmfblock(struct ccw_device *cdev,
1167                                        enum dev_event dev_event)
1168 {
1169         cmf_retry_copy_block(cdev);
1170         cdev->private->state = DEV_STATE_ONLINE;
1171         dev_fsm_event(cdev, dev_event);
1172 }
1173
1174 static void
1175 ccw_device_quiesce_done(struct ccw_device *cdev, enum dev_event dev_event)
1176 {
1177         ccw_device_set_timeout(cdev, 0);
1178         if (dev_event == DEV_EVENT_NOTOPER)
1179                 cdev->private->state = DEV_STATE_NOT_OPER;
1180         else
1181                 cdev->private->state = DEV_STATE_OFFLINE;
1182         wake_up(&cdev->private->wait_q);
1183 }
1184
1185 static void
1186 ccw_device_quiesce_timeout(struct ccw_device *cdev, enum dev_event dev_event)
1187 {
1188         int ret;
1189
1190         ret = ccw_device_cancel_halt_clear(cdev);
1191         switch (ret) {
1192         case 0:
1193                 cdev->private->state = DEV_STATE_OFFLINE;
1194                 wake_up(&cdev->private->wait_q);
1195                 break;
1196         case -ENODEV:
1197                 cdev->private->state = DEV_STATE_NOT_OPER;
1198                 wake_up(&cdev->private->wait_q);
1199                 break;
1200         default:
1201                 ccw_device_set_timeout(cdev, HZ/10);
1202         }
1203 }
1204
1205 /*
1206  * No operation action. This is used e.g. to ignore a timeout event in
1207  * state offline.
1208  */
1209 static void
1210 ccw_device_nop(struct ccw_device *cdev, enum dev_event dev_event)
1211 {
1212 }
1213
1214 /*
1215  * Bug operation action.
1216  */
1217 static void
1218 ccw_device_bug(struct ccw_device *cdev, enum dev_event dev_event)
1219 {
1220         CIO_MSG_EVENT(0, "dev_jumptable[%i][%i] == NULL\n",
1221                       cdev->private->state, dev_event);
1222         BUG();
1223 }
1224
1225 /*
1226  * device statemachine
1227  */
1228 fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
1229         [DEV_STATE_NOT_OPER] = {
1230                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1231                 [DEV_EVENT_INTERRUPT]   = ccw_device_bug,
1232                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1233                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1234         },
1235         [DEV_STATE_SENSE_PGID] = {
1236                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1237                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_pgid_irq,
1238                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1239                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1240         },
1241         [DEV_STATE_SENSE_ID] = {
1242                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1243                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1244                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1245                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1246         },
1247         [DEV_STATE_OFFLINE] = {
1248                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1249                 [DEV_EVENT_INTERRUPT]   = ccw_device_offline_irq,
1250                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1251                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1252         },
1253         [DEV_STATE_VERIFY] = {
1254                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1255                 [DEV_EVENT_INTERRUPT]   = ccw_device_verify_irq,
1256                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1257                 [DEV_EVENT_VERIFY]      = ccw_device_delay_verify,
1258         },
1259         [DEV_STATE_ONLINE] = {
1260                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1261                 [DEV_EVENT_INTERRUPT]   = ccw_device_irq,
1262                 [DEV_EVENT_TIMEOUT]     = ccw_device_online_timeout,
1263                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1264         },
1265         [DEV_STATE_W4SENSE] = {
1266                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1267                 [DEV_EVENT_INTERRUPT]   = ccw_device_w4sense,
1268                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1269                 [DEV_EVENT_VERIFY]      = ccw_device_online_verify,
1270         },
1271         [DEV_STATE_DISBAND_PGID] = {
1272                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1273                 [DEV_EVENT_INTERRUPT]   = ccw_device_disband_irq,
1274                 [DEV_EVENT_TIMEOUT]     = ccw_device_onoff_timeout,
1275                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1276         },
1277         [DEV_STATE_BOXED] = {
1278                 [DEV_EVENT_NOTOPER]     = ccw_device_offline_notoper,
1279                 [DEV_EVENT_INTERRUPT]   = ccw_device_stlck_done,
1280                 [DEV_EVENT_TIMEOUT]     = ccw_device_stlck_done,
1281                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1282         },
1283         /* states to wait for i/o completion before doing something */
1284         [DEV_STATE_CLEAR_VERIFY] = {
1285                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1286                 [DEV_EVENT_INTERRUPT]   = ccw_device_clear_verify,
1287                 [DEV_EVENT_TIMEOUT]     = ccw_device_nop,
1288                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1289         },
1290         [DEV_STATE_TIMEOUT_KILL] = {
1291                 [DEV_EVENT_NOTOPER]     = ccw_device_online_notoper,
1292                 [DEV_EVENT_INTERRUPT]   = ccw_device_killing_irq,
1293                 [DEV_EVENT_TIMEOUT]     = ccw_device_killing_timeout,
1294                 [DEV_EVENT_VERIFY]      = ccw_device_nop, //FIXME
1295         },
1296         [DEV_STATE_QUIESCE] = {
1297                 [DEV_EVENT_NOTOPER]     = ccw_device_quiesce_done,
1298                 [DEV_EVENT_INTERRUPT]   = ccw_device_quiesce_done,
1299                 [DEV_EVENT_TIMEOUT]     = ccw_device_quiesce_timeout,
1300                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1301         },
1302         /* special states for devices gone not operational */
1303         [DEV_STATE_DISCONNECTED] = {
1304                 [DEV_EVENT_NOTOPER]     = ccw_device_nop,
1305                 [DEV_EVENT_INTERRUPT]   = ccw_device_start_id,
1306                 [DEV_EVENT_TIMEOUT]     = ccw_device_bug,
1307                 [DEV_EVENT_VERIFY]      = ccw_device_start_id,
1308         },
1309         [DEV_STATE_DISCONNECTED_SENSE_ID] = {
1310                 [DEV_EVENT_NOTOPER]     = ccw_device_recog_notoper,
1311                 [DEV_EVENT_INTERRUPT]   = ccw_device_sense_id_irq,
1312                 [DEV_EVENT_TIMEOUT]     = ccw_device_recog_timeout,
1313                 [DEV_EVENT_VERIFY]      = ccw_device_nop,
1314         },
1315         [DEV_STATE_CMFCHANGE] = {
1316                 [DEV_EVENT_NOTOPER]     = ccw_device_change_cmfstate,
1317                 [DEV_EVENT_INTERRUPT]   = ccw_device_change_cmfstate,
1318                 [DEV_EVENT_TIMEOUT]     = ccw_device_change_cmfstate,
1319                 [DEV_EVENT_VERIFY]      = ccw_device_change_cmfstate,
1320         },
1321         [DEV_STATE_CMFUPDATE] = {
1322                 [DEV_EVENT_NOTOPER]     = ccw_device_update_cmfblock,
1323                 [DEV_EVENT_INTERRUPT]   = ccw_device_update_cmfblock,
1324                 [DEV_EVENT_TIMEOUT]     = ccw_device_update_cmfblock,
1325                 [DEV_EVENT_VERIFY]      = ccw_device_update_cmfblock,
1326         },
1327 };
1328
1329 /*
1330  * io_subchannel_irq is called for "real" interrupts or for status
1331  * pending conditions on msch.
1332  */
1333 void
1334 io_subchannel_irq (struct device *pdev)
1335 {
1336         struct ccw_device *cdev;
1337
1338         cdev = to_subchannel(pdev)->dev.driver_data;
1339
1340         CIO_TRACE_EVENT (3, "IRQ");
1341         CIO_TRACE_EVENT (3, pdev->bus_id);
1342         if (cdev)
1343                 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1344 }
1345
1346 EXPORT_SYMBOL_GPL(ccw_device_set_timeout);